CSV Add Row Numbers
Prepend or append a sequential ID column to CSV with configurable start, step, padding, and prefix or suffix.
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Add sequential row IDs to CSV
Paste a CSV with a header row, then prepend or append a numbered column with a custom name, start value, step, zero-padding, and optional prefix or suffix. Processing stays in your browser.
Related: CSV Formatter and CSV Dedupe.
Frequently Asked Questions
Does the header row get a number?
No. Only data rows receive sequential IDs; the header row keeps your column names.
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